How will you avoid duplicate entries in the forms?

We can restrict duplicate entries in the form
cheak which coloum can be maintained uniqueness
for that coloumn item text
write a trigger when_key_navigate
e_empno number(5);
cursor c is select * from emp;
for i in e_emp loop
if e_empno= i.empno then
dbms_output.put_line("already exist");
end if;
end loop;


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